1634221663 has 4 divisors (see below), whose sum is σ = 1665056088. Its totient is φ = 1603387240.

The previous prime is 1634221643. The next prime is 1634221703. The reversal of 1634221663 is 3661224361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1634221663 - 2²¹ = 1632124511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1634221643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15417133 + ... + 15417238.

It is an arithmetic number, because the mean of its divisors is an integer number (416264022).

Almost surely, 2^1634221663 is an apocalyptic number.

1634221663 is a deficient number, since it is larger than the sum of its proper divisors (30834425).

1634221663 is an equidigital number, since it uses as much as digits as its factorization.

1634221663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30834424.

The product of its digits is 31104, while the sum is 34.

The square root of 1634221663 is about 40425.5075787553. The cubic root of 1634221663 is about 1177.8870698544.

The spelling of 1634221663 in words is "one billion, six hundred thirty-four million, two hundred twenty-one thousand, six hundred sixty-three".